Doorlock mechanism



July 27, 1926. 1,593,667

4. E.'O. MURMANN DOQRLOCK MEGHANI SM Filed March 1924 INVENTOR.

ATTORNEYS Patented July 27, 1926.

PATENT OFFICE.

EUGENE 0. MURMANN, OF GLENDALE, CALIFORNIA.

DOORLOCK MECHANISM.

Application filed March 24, 1924. Serial No. 701,382.

This invention relates to a door lock having means for deadlocking abolt. The primary object of this invention is to provide a lockmechanism so arranged that a limited movement of a key or look mechanismactuating member from its unlocking position toward its locking positionwill deadlock the bolt. Other objects of this invention are to provide asimple, durable, compact, easily installed, and easily manipulatedmechanism.

These objects are obtained by means of the embodiment of my invention inwhich:

Fig. 1 is a section through a fragment of a door and through a key lockembodying my invention; Fig. 2 is a section as seen on the line 2-2 ofFig. 1; Fig. 3 is a view similar to Fig. 1 showing a fragment of themechanism with parts thereof in deadlooking position; and Fig. 4 is asectional view showing a modified form of my invention embodied in alock having a key bolt and a latch bolt.

Referring more particularly to Figs. 1, 2, and 3, a lock is showncomprising a bolt unit and a bolt actuating mechanism unit. The boltunit is housed in a cylindrical casing such that the door 5 may have arecess bored therein with a drill, and the bolt unit slipped therein.The bolt unit casing is indicated by 6 and is cut away to provide anopening for access thereto. Secured to the housing 6 is the selvageplate 7, whereby the bolt may be secured to the door. An opening isbored through the door transverse to the bolt recess and a boltactuating unit mounted therein. This unit has a cylindrical housing 8which fits into the recess and has an opening through which theinterconnecting members of the bolt mechanism and the bolt actuatingmechanism may project.

The bolt actuating member comprises a plate 9 adapted to cover one endof the re cess, and a barrel body 10 preferably formed integraltherewith. Formed on the other end of the body 10 is a flange 11. Anescutcheonplate 12 is secured to the flange by means of screws 13. Acylinder plug 14: is disposed in a bore of the barrel. The plug andbarrel are preferably of the well known cylinder lock type, the detailsof which are well known in the art and need not be further described.However, upon insertion of the proper key 15 in the keyhole of the lock,the plug is released from the barrel so that it may be rotated. The endof the plug is provided with a disk 16 having on its periphery spacedabutments 17 and 17. Disk 16 is spaced from flange 11 so that thecylinder plug extends beyond the barrel. Pivotally mounted upon thisextension is a rocker comprising a ring 18 and a roll-back arm 19extending radially therefrom. Projecting inwardly from the side of thearm is a rib 20. At the end of the arm and extending laterally therefromis a finger. The finger is adapted to engage the bolt mechanism. Thelower shoulder of the rib 20 is disposed to be engaged by the abutmentsupon the ring 16 so that rotation of the cylinder plug 14L sufficientlyfar in either direction will swing the rocker, there being a lost motionconnection between the plug and the idler arm.

Secured in one end of the housing 6 is a disk wall 21 having a slotthrough which extends the tail 22 of a lock bolt 23. The tail isprovided with shoulders serving as abutments for a compression spring2 1. The spring 24 tends to hold the bolt 23 in its protracted orlooking position. A recess 25 is provided on the under side of the tail22 so arranged that the finger 19 may be disposed therein and movedagainst the rear wall thereof so as to retract the bolt. Thus, byturning the key, the bolt may be retracted and the door unlocked.

A pin 26 is fixed to the tail and extends through an elongated slot in aslide plate 27. The slide plate has secured thereto a pin 28 riding inan elongated slot 29 formed in the tail.

On the lower side of the slide plate is a notch 30 in which the finger21 is disposed so that rotation of the plug and swinging of the idlerwill cause movement of the slide plate. Pivotally mounted uponthe pin 26is a tumbler 31. The tumbler extends through the slot in disk 21 and isprovided with a shoulder 32. An inclined slot 33 in the tumbler 31 isprovided and extending therethrough is the pin 28. It is obvious thatsliding the plate 27 forwardly on the tail of the bolt will cause thepin 28 to ride in the slot 33 and lift the tumbler 31 into the positionshown in Fig. 3. In this position the shoulder 32 is disposed in frontof the disk 31 and the bolt is deadlocked. Pressure upon the bolt 23tending to retract it will be met by the shoulder 82 engaging the disk 3and preventing movement. In order to release the deadlock, plate 27 mustbe moved toward the rear on the tail. Pin 28 willthenride in slot 33,swinging the tumbler 31 downwardly so that shoulder 32 clears the wallof disk 21 and the bolt may be retracted.

Suppose the parts are in the position shown in Fig.v 1. and it isdesired to unlock the door. The key is inserted in the plug and thelatter turned clockwise. This causes disk 16 to be turned clockwise,shoulder 17 engaging the rib 20 and thereafter swinging the idler arm tothe right. The finger of the idler arm engages the back wall of thenotch and moves the tail 22 and bolt against the action of spring 24,retracting the bolt from the keeper and unlocking the door. If it isdesired to deadlock the bolt, the-key is inserted, in the plug andturned toward locking position. Abutment 17 en gages ribs 20 and swingsthe idler arm 19 so that the finger moves slide plate 27 forwardly tothe position shown in Fig. 3. This causes the tumbler 31 to be lifted sothat shoulder 32 is in front of disk 21. Key 15: may be turned to avposition such that it may be withdrawn from the keyhole. Due to thespace between the abutments 17 and 17, the key may be rotated a limiteddisance before the idler arm would be moved. This limited distance issufficient to position the key such that it. may be withdrawn fromthe-keyhole.

Referring more. particularly to Fig. 4, a structure including, a latchbolt and a key bolt which may be operated by suitable mechanism. such asa key actuating mechanism ofthe character shown in Figs. 1, 2, and 3-may be employed therewith. The details of the key actuatingunit and themechanism for operating the latch bolt are not essential to theinvention. A single housing for both the key bolt and latch bolt isindicated by35. Secured to the housing is a selvage plate 36. Atransverse extending abutment plate fixed inthe housing is indicated by37, andslidably extending through a slot therein is the tail 38 of thelatch bolt head 89. Fixed to the tail is a collar 40 positioned to bereached through an opening 41 in the housing in such a manner that aknob mechanism may be engaged with the collar for moving the latch bolt.A. compression spring 42 is disposed over the; tail between plate 37 andcollar 40 tending to hold the latch bolt in its forward position. Thetail is joined to the latch bolt head in such a manner as to form ashoulder 43.

Disposed below the latch bolt is a key bolt 44. The key bolt isconstructed in accordance with the key bolt shown in Figs. 1, 2, and 3,except. that no compression spring for protracting the bolt is employed.The idler operated from the key is used both to protract and retract thebolt. Extending upwardly from the key bolt is a lug having a bevelledupper face.

Pivotally mounted on the casing between the latchbolt and the key boltis a tumbler 46. The tumbler has a bevelled under face 47 correspondingto the bevel on lug 45, and the tumbler rests against the same. Anextension 48' on. the tumbler is arranged to be opposed to shoulder 43on the key bolt. When the key bolt is inits protracted or lockingposition, the lug 45 will position the tumbler 46 such that extension48' is behind the shoulder 43 and will deadlock the latter. By movingthe key bolt to its retracted or unlocking position, tumbler 46 will bedepressed to its lower position, in which position the extension 48 isdisposed below the shoulder 43' on the latch bolt head, and the latchbolt is free to be" moved. In the construction just described, thetumbler for deadlocking is actuated indirectly from the key. Byadvancing the key or its equivalent towards locking position, the latchbolt is deadlocked.

What I claim is z The combination of a lock. casing, a latch bolttherein, a tumbler pivotally mounted on said bolt so as to be swung intoposition to engage said casing when said bolt is in protractedpositionand to obstruct the retraction of said bolt whereby to deadlockthe latter, a key actuable mechanism for retracting said bolt having aroll-back arm engaging said bolt and movable longitudinally thereofwhereby to retract the latter, a slide mounted on said bolt to beengaged by said roll-back arm and initially be moved.

thereby, means interconnecting; said slide and said tumbler arranged sothat initial movement of said slide toward protracted position willswing said tumbler into deadlocking position.

In witness-that I claim the foregoing I have hereunto subscribed my namethis 18th day of March, 1924.

EUGENE" O. MURMANN.

